EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To secure high NOx conversion rate regardless of the temperature of an NOx selective reduction catalyst. SOLUTION: The NOx selective reduction catalyst 15 is disposed in the exhaust passage of an internal combustion engine. An oxidation catalyst 16 capable of controlling NOx at...

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Bibliographic Details
Main Authors ODA TOMIHISA, ITO TAKEKAZU, TAUCHI YUTAKA, TOSHIOKA TOSHISUKE, ITO KAZUHIRO
Format Patent
LanguageEnglish
Published 23.10.2008
Subjects
BLASTING
ENGINE PLANTS IN GENERAL
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL
HEATING
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
STEAM ENGINES
TRANSPORTING
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To secure high NOx conversion rate regardless of the temperature of an NOx selective reduction catalyst. SOLUTION: The NOx selective reduction catalyst 15 is disposed in the exhaust passage of an internal combustion engine. An oxidation catalyst 16 capable of controlling NOx at a lower temperature than in the case of the NOx selective reduction catalyst 15 is disposed in the exhaust passage of the engine on the downstream side of the NOx selective reduction catalyst 15. When the NOx selective reduction catalyst 15 is installed within the temperature range TM in which it can control NOx, urea necessary for reducing NOx is supplied to the NOx selective reduction catalyst 15. When the NOx selective reduction catalyst 15 is under the temperature range TM in which it can control NOx, urea necessary for controlling NOx is supplied to the oxidation catalyst 16. COPYRIGHT: (C)2009,JPO&INPIT
Bibliography:Application Number: JP20070100535